title: Nanoparticle plasmon resonances in the near-static limit.
abstract: Localized surface plasmon resonances of metal nanoparticles of arbitrary shape are analyzed in the near-static limit with retardation included to the second order. Starting from the electrostatic approximation, the second-order correction to the resonant dielectric constant is expressed by means of a triple surface integral. For arbitrary nanoparticles with cylindrical symmetry we show how the triple surface integral can be significantly simplified, resulting in a computationally efficient scheme for evaluation of nanoparticle plasmon eigenresonances in the near-static limit. The approach allows for calculation of both dipolar and higher-order resonances.
authors.affiliation: Department of Physics and Nanotechnology, Aalborg University, Aalborg Øst, Denmark. tgp@nano.aau.dk
authors.forename: Thomas G
authors.initials: TG
authors.lastname: Pedersen
authors.forename: Jesper
authors.initials: J
authors.lastname: Jung
authors.forename: Thomas
authors.initials: T
authors.lastname: Søndergaard
authors.forename: Kjeld
authors.initials: K
authors.lastname: Pedersen
mesh_terms: D008027:Light; D053758:Nanoparticles / Q000737:chemistry*; D055620:Optical Phenomena; D010316:Particle Size; D012834:Silver / Q000737:chemistry; D055672:Static Electricity; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: C009495:titanium dioxide; D012834:Silver; D014025:Titanium